At only £30 for 5 great games The Orange Box is really good value for money. Half Life is a good game with great action and some nice, but not too challenging puzzle elements added. Despite this it falls short of being amazing as it starts to drag on at some points and experiences a lot of glitches.
Team Fortess 2 is rubbish though and you'd be better off buying it for thePC as it offers a lot more features and has a lot more players.
Last, and certainly not least, Portal! Portal is amazing and is worth the full price on its own. Portal offers a lot of brilliant puzzles which will really make you think. The game is a good short length so you don't start repeating the same puzzles over and over but still leaves you wanting more. A brilliant game.
Overall, the Orange Box is a great game and should appeal to most gamers as it offers a lot of variety. I strongly reccommend you get this game.